You Can Count On It

I recently picked up the cut in the photo below. It is 7 1/4" x 12" and the numbers run from 1 to 500 starting in the upper left hand corner and across the row to the right, continuing back to the left side and across to the right in the second row, etc. My guess is that this is for some kind of counting sheet: one checks off the numbers on the sheet as one counts whatever one needs to count then, when the last item is counted, the total is self-evident. I would really appreciate any input either to confirm or deny my own suspicion and/or provide the definitive answer. I'm counting on you...